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Former UNIT luminary Liz Shaw and her assistant Lou Bayliss are investigating a series of bizarre murders, all committed near a soon-to-be-closed psychiatric hospital.

When the hospital is unexpectedly reprieved by rich industrialist Peter Russell, events seem to move out of Liz's control. Are the incumbent director of the clinic, Doctor Dove and his predecessor, Doctor O'Kane, harbouring the killer? What is the centuries-old horror hidden in the grounds?

Among the items on Jeremiah O'Kane's shelves are the videos Nightshade, Nightshade 2 and Nightshade and the Imps, serials or (more likely) movie adaptations in the Nightshade series which originally starred Edmund Trevithick.

While discussing the group similar to PROBE she was once a part of, Liz sees a picture of The Brigadier on a wall and begins drawing on it with makeup.

This is the first of four films featuring the PROBE organisation. It pre-dates Torchwood as the first ongoing spin-off of the Doctor Who universe.

This story marks the first time that Pertwee, Aldred, Jameson and Davison have played more than one character in the Doctor Who universe. It is not the first time for Baker and McCoy, however: Baker played Maxil in TV: Arc of Infinity and McCoy briefly played the Sixth Doctor in TV: Time and the Rani. Pertwee, Baker, McCoy and Davison had previously reunited in BBV's 1993 filmThe Airzone Solution,which as it is set outside of the Doctor Who universe this Wiki does not cover. Davison would appear as a different character in the second and fourth P.R.O.B.E. films,The Devil of WinterborneandGhosts of Winterborne,whilst Aldred would go on to portray a number of different characters in BBV andReeltimefilms throughout the decade.Interestingly this is not the last time Baker, McCoy and Davison would play different characters set within the Doctor Who universe, as they reunited again inAUDIO:Zagreus.

↑Mark Gatiss (23 January 2008). Author's Notes - Introduction. Doctor Who - Classic Series - Ebooks. BBC. Archived from the original on 23 January 2008. “A year or so later when I was making The Zero Imperative with Bill Baggs, Gary Gillett mocked up some videos that can just be made out on Jon Pertwee's shelves.”